media: i2c: imx335: Enable regulator supplies

[ Upstream commit fea91ee7 ]

Provide support for enabling and disabling regulator supplies to control
power to the camera sensor.

While updating the power on function, document that a sleep is
represented as 'T4' in the datasheet power on sequence.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Stable-dep-of: 99d30e2f ("media: imx335: Fix reset-gpio handling")
Signed-off-by: Sasha Levin <sashal@kernel.org>